I prefer to cut off inflos on rooting cuttings as I believe they consume too much of the stored energy and delay or prevent rooting.

I would poke a hole in the soft spots with a needle to see if latex oozes out. If it does, I would let the cutting continue to try to root. If it does not, I would pull the cutting and check for rot. Look at the end of the cutting to see if it is black and soft. If so, cut back on the end until you have clear, white wood. Sterilize your knife with alcohol, peroxide, or other disinfectant between cuts. Once you have clear wood, use a rooting hormone with fungicide and try rooting again.
Mike

Thank Mike. I'll do what you suggest and see what happens.